数据传输对象中的com.google.gwt.user.client.rpc.SerializationException

我正在开发一个互连GWT和Hibernate的应用程序。从GWT服务器端我有以下代码：数据传输对象中的com.google.gwt.user.client.rpc.SerializationException

@Override 
public List<AlarmDTO> getAlarms() throws Exception{ 
    return deviceService.getAlarms(); 
}

从休眠方面，有一个报警类别：

public List<AlarmDTO> getAlarms() { 
    @SuppressWarnings("unchecked") 
    List<Alarm> alarms = new ArrayList<Alarm>(DatabaseManager.createQuery("from Alarm")); 
    List<AlarmDTO> alarmsDTOs = new ArrayList<AlarmDTO>(alarms != null ? alarms.size() : 0); 
    if (alarms != null) { 
     for (Alarm alarm : alarms) { 
      String date = format.format(alarm.gettDate()); 
      alarmsDTOs.add(new AlarmDTO(alarm.getiAlarmId(),alarm.getsDescription(),alarm.getsCause(),date,alarm.iSetPointId,alarm.getiDeviceId())); 
     } 
    } 
    return alarmsDTOs; 
}

它返回AlarmDTO对象的名单。这种类型的对象是一个数据传输对象。它的代码是：

public class AlarmDTO implements Serializable{ 
    private static final long serialVersionUID = 1L; 
    private int iAlarmId; 
    private String sDescription; 
    private String sCause; 
    private String sDate; 
    private int iSetPointId; 
    private int iDeviceId; 

    public AlarmDTO(){} 

    public AlarmDTO(int iAlarmId,String sDescription,String sCause,String sDate,int iSetPointId,int iDeviceId){ 
    this.iAlarmId = iAlarmId; 
    this.sDescription = sDescription; 
    this.sCause = sCause; 
    this.sDate = sDate; 
    this.iSetPointId = iSetPointId; 
    this.iDeviceId = iDeviceId; 
    } 
}

然而，当我运行应用程序，它抛出一个异常com.google.gwt.user.client.rpc.SerializationException：

Exception while dispatching incoming RPC call 
com.google.gwt.user.client.rpc.SerializationException: Type 'com.cartif.dtos.EnergyDTO' was not included in the set of types which can be serialized by this SerializationPolicy or its Class object could not be loaded. For security purposes, this type will not be serialized.: instance = [email protected] 
at  com.google.gwt.user.server.rpc.impl.ServerSerializationStreamWriter.serialize(ServerSerializationStreamWriter.java:615) 
at  com.google.gwt.user.client.rpc.impl.AbstractSerializationStreamWriter.writeObject(AbstractSerializationStreamWriter.java:126) 
at com.google.gwt.user.client.rpc.core.java.util.Collection_CustomFieldSerializerBase.serialize(Collection_CustomFieldSerializerBase.java:45) 
at com.google.gwt.user.client.rpc.core.java.util.ArrayList_CustomFieldSerializer.serialize(ArrayList_CustomFieldSerializer.java:40) 
at com.google.gwt.user.client.rpc.core.java.util.ArrayList_CustomFieldSerializer.serializeInstance(ArrayList_CustomFieldSerializer.java:50) 
at com.google.gwt.user.client.rpc.core.java.util.ArrayList_CustomFieldSerializer.serializeInstance(ArrayList_CustomFieldSerializer.java:28) 
at com.google.gwt.user.server.rpc.impl.ServerSerializationStreamWriter.serializeImpl(ServerSerializationStreamWriter.java:736) 
at com.google.gwt.user.server.rpc.impl.ServerSerializationStreamWriter.serialize(ServerSerializationStreamWriter.java:617) 
at com.google.gwt.user.client.rpc.impl.AbstractSerializationStreamWriter.writeObject(AbstractSerializationStreamWriter.java:126) 
at com.google.gwt.user.server.rpc.impl.ServerSerializationStreamWriter$ValueWriter$8.write(ServerSerializationStreamWriter.java:153) 
at com.google.gwt.user.server.rpc.impl.ServerSerializationStreamWriter.serializeValue(ServerSerializationStreamWriter.java:535) 
at com.google.gwt.user.server.rpc.RPC.encodeResponse(RPC.java:616) 
at com.google.gwt.user.server.rpc.RPC.encodeResponseForSuccess(RPC.java:474) 
at com.google.gwt.user.server.rpc.RPC.invokeAndEncodeResponse(RPC.java:571) 
at com.google.gwt.user.server.rpc.RemoteServiceServlet.processCall(RemoteServiceServlet.java:208) 
at com.google.gwt.user.server.rpc.RemoteServiceServlet.processPost(RemoteServiceServlet.java:248) 
at com.google.gwt.user.server.rpc.AbstractRemoteServiceServlet.doPost(AbstractRemoteServiceServlet.java:62) 
at javax.servlet.http.HttpServlet.service(HttpServlet.java:727) 
at javax.servlet.http.HttpServlet.service(HttpServlet.java:820) 
at org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:487) 
at org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:362) 
at org.mortbay.jetty.security.SecurityHandler.handle(SecurityHandler.java:216) 
at org.mortbay.jetty.servlet.SessionHandler.handle(SessionHandler.java:181) 
at org.mortbay.jetty.handler.ContextHandler.handle(ContextHandler.java:726) 
at org.mortbay.jetty.webapp.WebAppContext.handle(WebAppContext.java:405) 
at org.mortbay.jetty.handler.ContextHandlerCollection.handle(ContextHandlerCollection.java:206) 
at org.mortbay.jetty.handler.HandlerCollection.handle(HandlerCollection.java:114) 
at org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:152) 
at org.mortbay.jetty.Server.handle(Server.java:320) 
at org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java:505) 
at org.mortbay.jetty.HttpConnection$RequestHandler.content(HttpConnection.java:842) 
at org.mortbay.jetty.HttpParser.parseNext(HttpParser.java:648) 
at org.mortbay.jetty.HttpParser.parseAvailable(HttpParser.java:211) 
at org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:380) 
at org.mortbay.io.nio.SelectChannelEndPoint.run(SelectChannelEndPoint.java:395) 
at org.mortbay.thread.BoundedThreadPool$PoolThread.run(BoundedThreadPool.java:450)

我遵循同样的策略其他objetcs和它的作品。我不知道为什么它现在不运行。有人能帮助我吗？

谢谢！

来源

2012-01-05 Jose Hdez

您还有AlarmDTO的获取者/设置者？尝试一个干净的构建。 – milan 2012-01-05 11:31:21

您可以分享更多关于异常的信息吗 - 发送时是在服务器上发生，还是在客户端尝试读取时发生？另外，AlarmDTO类是否可以转换为客户端代码（与其他工作DTO相同）？ – 2012-01-05 22:07:54

我为EnergyDTO添加了与AlarmDTO类似的ExceptionDTO – 2012-01-10 07:01:51

我解决了这个问题。我通过字符串属性更改了双重属性，它起作用。

来源

2012-01-10 07:57:51

Docs say：

Fields that are declared final are also not exchanged during RPCs, so they should 
generally be marked `transient`.

试试看吧。

来源

2012-01-05 22:45:02

我只声明了最终的serialVersionUID，但它不是重要的属性。 – 2012-01-10 06:57:31

数据传输对象中的com.google.gwt.user.client.rpc.SerializationException

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